微囊藻毒素-LR和铜绿微囊藻裂解液对水稻光合作用的影响

发布时间：2018-05-08 06:38

本文选题：微囊藻毒素-LR + 铜绿微囊藻　；参考：《中国环境科学》2017年11期

【摘要】：蓝藻水华在生长和衰亡过程中会产生包括微囊藻毒素在内的多种有毒代谢产物,这些毒素可能会随灌溉用水进入农田而对作物带来不利影响.本研究选用微囊藻毒素-LR(MC-LR)纯品和铜绿微囊藻裂解液分别对营养生长期水稻进行21d暴露处理,考察不同浓度(0.1,1.0,10.0,100.0,500.0μg/L)MC-LR和不同稀释倍数(0.002,0.02和0.2倍)铜绿微囊藻裂解液对水稻叶绿素荧光强度、净光合速率、蒸腾速率、气孔导度及叶片超微结构的影响.研究结果表明,MC-LR对水稻光合作用特征参数具有显著的抑制作用,其中蒸腾速率和气孔导度对MC-LR暴露最为敏感,比较来看,考察浓度范围内铜绿微囊藻裂解液对植物光合作用特性指标影响显示出不同的特点,甚至表现出一定刺激和促进作用,0.02倍裂解液暴露显著促进植株蒸腾作用和气孔导度.此外,高浓度的单一MC-LR和高浓度铜绿微囊藻裂解液都能对水稻叶片超微结构能造成一定程度的损伤.铜绿微囊藻裂解液和MC-LR作用特点不一致,推测是裂解液中其他组分造成微囊藻毒素有效性的改变和毒性的降低.
[Abstract]:A variety of toxic metabolites, including microcystins, may be produced during the growth and decay of cyanobacteria bloom in the process of growth and decay. These toxins may have adverse effects on crops with irrigation water. This study selected microcystins -LR (MC-LR) pure and Microcystis aeruginosa cracking solution for 21d storm in the vegetative growth period of rice, respectively. The effects of different concentrations (0.1,1.0,10.0100.0500.0 mu g/L) MC-LR and different dilution multiple (0.002,0.02 and 0.2 times) of Microcystis on chlorophyll fluorescence intensity, net photosynthetic rate, transpiration rate, stomatal conductance and leaf ultrastructure of rice were investigated. The results showed that the characteristic parameters of photosynthesis of rice with MC-LR were obvious. The transpiration rate and stomatal conductance were most sensitive to MC-LR exposure. In comparison, the effects of Microcystis aeruginosa lysate on plant photosynthesis characteristics showed different characteristics, even stimulated and promoted, and 0.02 times the lysate exposure significantly promoted plant transpiration. In addition, the high concentration of single MC-LR and high concentration of Microcystis aeruginosa lysate can damage the ultrastructure of rice leaves to a certain extent. The effect of Microcystis aeruginosa lysate and MC-LR is inconsistent. It is presumed that the other components in the lysate cause the change of microcystin efficiency and the decrease of toxicity.

【作者单位】：解放军理工大学国防工程学院;环境保护部南京环境科学研究所国家环境保护农药环境评价与污染控制重点实验室;
【基金】：国家自然科学基金青年基金(21407056)
【分类号】：X503.231;X52

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